CN114538857B - Environment-friendly carbonization-resistant cement concrete - Google Patents
Environment-friendly carbonization-resistant cement concrete Download PDFInfo
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- CN114538857B CN114538857B CN202210269336.2A CN202210269336A CN114538857B CN 114538857 B CN114538857 B CN 114538857B CN 202210269336 A CN202210269336 A CN 202210269336A CN 114538857 B CN114538857 B CN 114538857B
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/023—Chemical treatment
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/2015—Sulfate resistance
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/2038—Resistance against physical degradation
- C04B2111/2061—Materials containing photocatalysts, e.g. TiO2, for avoiding staining by air pollutants or the like
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/22—Carbonation resistance
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/29—Frost-thaw resistance
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
- C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention discloses green carbonization-resistant cement concrete, which is prepared by adding modified TiO doped with iron ions 2 Modified TiO 2 Photocatalytic performance, can effectively degrade CO in air 2 The carbonization resistance of the concrete is improved, the benzene ring structure and molecular chains with different length gradients are introduced into the surface of the fumed silica by modifying the fumed silica, the aim of improving the dispersibility is achieved, the introduction of the modified fumed silica is beneficial to the combination of a matrix and basalt fibers, and the mechanical properties of the concrete are macroscopically improved.
Description
Technical Field
The invention relates to the technical field of concrete, in particular to green carbonization-resistant cement concrete.
Background
The carbonization of concrete refers to the phenomenon that media such as carbon dioxide, sulfur dioxide and the like in the surrounding environment penetrate into the surface of the concrete and react with alkaline substances in cement stones, so that the pH value is lowered. The alkalinity in the concrete is reduced after the concrete is carbonized, the passivation film on the surface of the steel bar is destroyed, the concrete loses the protection effect on the steel bar, the carbonization not only can cause the volume shrinkage of the concrete, the steel bar in the concrete is corroded, the service life of the building is reduced, the service life of the concrete is seriously influenced, and especially in the day of the increasingly serious greenhouse effect, the carbonization performance of the concrete is very necessary to be improved.
CN113045272a discloses a green environment-friendly concrete and a preparation method thereof, wherein the green environment-friendly concrete comprises the following components in parts by mass: 265-285 parts of cementing material; 900-1100 parts of coarse aggregate; 35-45 parts of nano silicon carbide; 25-30 parts of potassium borate; 20-25 parts of calcium chloride; 160-175 parts of water; the preparation method comprises the following steps: step 1) uniformly mixing coarse aggregate, nano silicon carbide, potassium borate and calcium chloride to obtain a mixture; step 2) uniformly mixing the mixture, the cementing material, the water reducer, the synergist and water to obtain green environment-friendly concrete slurry; and 3) naturally curing the green environment-friendly concrete slurry at normal temperature to obtain the green environment-friendly concrete. The green environment-friendly concrete can permeate water into an underground pipe network channel, improves the utilization rate of natural water reduction, is green and environment-friendly, has better freeze-thawing resistance, and can maintain good compressive strength. However, this invention does not solve the problem that concrete is easily carbonized.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, the technical problems to be solved by the present invention are: (1) improving the sulfate freezing resistance of the concrete; (2) improving the mechanical strength of the concrete; (3) Solving the layering phenomenon among different components in the concrete; (4) improving the carbonization resistance of the concrete.
The salt freezing damage is one of the important factors influencing the durability and the service life of the concrete, and the influence of the salt freezing phenomenon on the concrete is particularly obvious in cold areas. Due to the lack of sulfate resistance, the surface of the concrete is broken by brine freezing and gradually diffuses to the inside to erode the concrete, so that the performance of the concrete is reduced in all aspects. In the traditional process, silica fume substances are often added to increase the salt tolerance of concrete, and fumed silica can be used as an additive for improving the salt tolerance due to the characteristics of high silica content, high specific surface area and the like.
The inventors found that the conventional method of adding fumed silica causes a problem of poor dispersibility of fumed silica. Because the surface of the fumed silica is rich in hydroxyl groups, aggregates are easy to form among particles, and the storage condition is relatively harsh; meanwhile, after the fumed silica is added into the concrete, a three-dimensional net-shaped structure is easily formed in a solid-liquid system due to hydrogen bonding, so that the local viscosity is increased, and the agglomeration phenomenon occurs. In summary, the use of fumed silica in concrete requires high storage and processing techniques, and is difficult to use in various environments.
Therefore, the inventors modified the conventional fumed silica, and introduced benzene ring structure and long and short chains on the surface of the fumed silica by using hydroxyl groups on the surface of the fumed silica, thereby synergistically exerting the effect. The steric hindrance provided by the benzene ring structure and the long and short chain is large, so that aggregation among fumed silica particles can be prevented; after the functional groups are introduced, the fumed silica particles are not easy to adsorb with each other under the action of electrostatic repulsion, so that the aim of improving the dispersibility is fulfilled. Because of the improvement of the dispersion performance, the fumed silica can carry a large amount of concrete hydration products to be attached to the surface of the basalt fiber, and the calcium ions and the hydroxyl ions in the concrete are adsorbed on the surface of the basalt fiber, so that the number of crystal nuclei for generating hydrated calcium silicate gel in the hydration process is increased, the combination of the fiber and a cement matrix is more compact, and the mechanical performance of the concrete is macroscopically improved.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a green anti-carbonization cement concrete is prepared from cement, medium sand, broken stone, basalt fiber, modified fumed silica, water reducer, and modified TiO doped with iron ions 2 And water, wherein the raw materials comprise the following components in parts by weight: 480-540 parts of cement, 480-540 parts of medium sand, 1050-1200 parts of crushed stone, 1.2-8 parts of basalt fiber, 15-36 parts of modified fumed silica, 6.5-13 parts of water reducer and 5-20 parts of iron ion doped modified TiO 2 190-220 parts of water.
Preferably, the cement is any one of P.I.42.5 Portland cement, P.I.42.5R Portland cement, P.II.42.5R Portland cement, P.O.42.5R Portland cement.
Preferably, the crushed stone is continuous graded crushed stone, and the mass ratio of the crushed stone is (1) that of 5-10 mm crushed stone, 10-20 mm crushed stone and 20-31.5 mm crushed stone: 2:1 is obtained by blending.
Preferably, the length of the basalt fiber is 1-3 mm.
Preferably, the water reducer is any one of naphthalene-based high-efficiency water reducer, aliphatic high-efficiency water reducer, amino high-efficiency water reducer and polycarboxylic acid high-performance water reducer.
Preferably, the modified fumed silica is any one of a high-dispersion fumed silica and an anti-delamination fumed silica.
Preferably, the preparation method of the high-dispersion fumed silica comprises the following steps:
x1, acidizing fumed silica by using inorganic acid to obtain acidified fumed silica for later use;
x2, dispersing acidified fumed silica in a mixture formed by ethanol and diethyl ether, then adding tetramethyl-m-xylylene diisocyanate, n-heptyl isocyanate and 2-naphthyl isocyanate, and reacting at 80-90 ℃ for 12-36 h under an anaerobic condition to obtain a reaction solution I for later use;
x3 is kept under anaerobic condition, the temperature of the reaction solution I is reduced to 55-70 ℃, propylene glycol butyl ether is added, and the reaction is continued for 1-4 hours to obtain a reaction solution II for standby;
x4 is kept under anaerobic condition, 2-bis (hydroxymethyl) malonic acid is added into the reaction solution II, the reaction is continued for 1 to 4 hours, then solid products are obtained after separation, and the high-dispersion fumed silica is obtained after alcohol washing, drying and crushing.
Preferably, the acidification treatment in step X1 is performed in parts by weight: 5 to 8 parts of fumed silica is taken and placed in 75 to 125 parts of hydrochloric acid with the concentration of 0.1 to 0.5mol/L, and soaked for 1 to 3 hours.
Preferably, the mixture of ethanol and diethyl ether in the step X2 is used in an amount of 150 to 300 parts by weight, wherein the mass ratio of ethanol to diethyl ether is 4:1.
preferably, the tetramethyl isophthalene diisocyanate in the step X2 is used in an amount of 8 to 24 parts by weight; the usage amount of the n-heptyl isocyanate is 1.5-5 parts; the using amount of the 2-naphthyl isocyanate is 0.3-1.2 parts.
Preferably, the propylene glycol butyl ether is used in the amount of 24 to 56 parts by weight in the step X3.
Preferably, the 2, 2-bis (hydroxymethyl) malonic acid in the step X4 is used in an amount of 0.4 to 2 parts by weight.
In the long-term practice and use process, the inventor finds that the sulfate resistance of the concrete is improved after the high-dispersion fumed silica is added into the concrete; the high dispersion fumed silica improves the microporous structure of the concrete, thereby reducing the diffusion rate of corrosive ions. However, in the use process, the microstructure of part of the concrete is layered, and as the use time is prolonged, the tiny layering can cause structural defects, so that various performances of the concrete are reduced. In view of this phenomenon, the inventors have observed and studied that the cause of the occurrence of the delamination phenomenon is the crystalline structure of the highly dispersed fumed silica itself. The invention discloses a method for preparing high-dispersion gas-phase silicon dioxide, which comprises the steps of curing concrete to form an ordered two-dimensional hexagonal structure, compacting and regulating the structure due to the combination of hexagonal crystal (100), (110) and (200) lattice planes, effectively preventing corrosion caused by diffusion of corrosive ions among holes, wherein the three-dimensional interlayer of the two-dimensional hexagonal structure has weaker connection and weak acting force, thus causing layering phenomenon.
Preferably, the preparation method of the delamination-preventing fumed silica comprises the following steps:
the method comprises the steps of Y1, acidizing fumed silica by using inorganic acid to obtain acidified fumed silica for later use;
dispersing acidified fumed silica in a mixture formed by ethanol and diethyl ether, then adding tetramethyl-m-xylylene diisocyanate, n-heptyl isocyanate and 2-naphthyl isocyanate, and reacting at 80-90 ℃ for 12-36 h under an anaerobic condition to obtain a reaction solution I for later use;
y3 is kept under anaerobic condition, the temperature of the reaction solution I is reduced to 55-70 ℃, propylene glycol butyl ether is added, and the reaction is continued for 1-4 hours to obtain a reaction solution II for standby;
y4 is kept under anaerobic condition, 2-bis (hydroxymethyl) malonic acid is added into the reaction solution II, the reaction is continued for 1 to 4 hours, then solid products are obtained after separation, and alcohol washing, drying and crushing are carried out, thus obtaining high-dispersion fumed silica for standby;
y5 dispersing high-dispersion gas-phase silicon dioxide in N, N-dimethylformamide, then adding mercaptopropyl methyl dimethoxy silane, reacting for 6-12 hours at 75-90 ℃, removing solvent, continuing to react for 1-4 hours, separating to obtain a solid product, and then washing with alcohol, washing with water, drying and crushing to obtain a solid product I for later use;
dispersing the solid product I in ethanol, adding methacrylamide and benzoin dimethyl ether, and reacting for 1-3 hours at 80-120 ℃ to obtain the layering-resistant fumed silica.
Preferably, the acidification treatment in step Y1 is performed in parts by weight: 5 to 8 parts of fumed silica is taken and placed in 75 to 125 parts of hydrochloric acid with the concentration of 0.1 to 0.5mol/L, and soaked for 1 to 3 hours.
Preferably, the mixture of ethanol and diethyl ether in the step Y2 is used in an amount of 150 to 300 parts by weight, wherein the mass ratio of ethanol to diethyl ether is 4:1.
preferably, the tetramethyl isophthalene diisocyanate in the step Y2 is used in an amount of 8 to 24 parts by weight; the usage amount of the n-heptyl isocyanate is 1.5-5 parts; the using amount of the 2-naphthyl isocyanate is 0.3-1.2 parts.
Preferably, the propylene glycol butyl ether is used in an amount of 24 to 56 parts by weight in the step Y3.
Preferably, the 2, 2-bis (hydroxymethyl) malonic acid in the step Y4 is used in an amount of 0.4 to 2 parts by weight.
Preferably, the N, N-dimethylformamide in the step Y5 is used in an amount of 100 to 150 parts by weight; the usage amount of the mercaptopropyl methyl dimethoxy silane in the step Y5 is 5-8 parts.
Preferably, the ethanol in the step Y6 is used in an amount of 30 to 90 parts by weight; the using amount of the methacrylamide is 0.3-0.6 part; the usage amount of benzoin dimethyl ether is 0.1-0.2 part.
The modified TiO doped with iron ions 2 The preparation method of (2) is as follows:
1) Dissolving 15-20mL of tetrabutyl titanate in 60-70mL of absolute ethyl alcohol to obtain a solution A;
2) Mixing 1-2mL of ferric nitrate nonahydrate with 3-5mL of water, adding 6-7mL of absolute ethyl alcohol into the mixture, and regulating the pH value of the solution to 5-6 by using 3-5mol/L of nitric acid aqueous solution to obtain solution B;
3) Dripping the solution A into the solution B at the speed of 1-2 drops/second, heating to 60-80 ℃ after dripping, and stirring for reacting for 2-4 hours; cooling to 20-40deg.C after the reaction, filtering, collecting the residue, washing with absolute ethanol for 2-3 times, drying in a 60-80deg.C drying oven for 6-8 hr, and grinding to obtain modified TiO doped with iron ions 2 。
The inventor finds that the addition of the modified titanium dioxide doped with the iron ions can obviously improve the carbonization resistance of the concrete, probably because the doped iron in the titanium dioxide improves the catalytic ability of the titanium dioxide, the iron ions are added into the crystal lattice of the titanium dioxide, and the iron ions replace part of the titanium ions, so that the energy band structure of the titanium dioxide is adjusted, the photocatalytic performance of the titanium dioxide is changed, and CO in the air can be effectively degraded 2 。
The invention also discloses a preparation method of the green carbonization-resistant cement concrete, which comprises the following steps:
s1, weighing raw materials according to a formula, sequentially adding cement, medium sand and broken stone into water, and stirring to obtain concrete coarse materials for later use;
s2, continuously and sequentially adding basalt fiber, modified fumed silica, water reducer and iron ion doped modified TiO into the concrete coarse material obtained in the step S1 2 Stirring to obtain concrete mortar for later use;
and S3, pouring, curing and maintaining the concrete mortar obtained in the step S2 through construction to obtain the green carbonization-resistant cement concrete.
On the basis of conforming to the common knowledge in the field, the above preferred conditions can be arbitrarily combined to obtain the preferred embodiments of the invention.
The invention has the following description and functions of partial raw materials in the formula:
basalt fiber: continuous fibers drawn from natural basalt have high breaking strength. The filler used as concrete in the invention is used for enhancing the strength of the concrete and reducing shrinkage.
Modified fumed silica: the product is obtained by modifying nanoscale white powder generated by hydrolysis of silicon halide in oxyhydrogen flame. The invention is used for improving the salt tolerance of concrete.
Tetramethyl isophthalylene diisocyanate: the diisocyanate with low toxicity and unique structure integrates the advantages of aliphatic isocyanate and aromatic isocyanate, and the elastomer prepared with the diisocyanate is soft, has high strength, high adhesion, high flexibility, high yellowing resistance, high acid resistance, high durability and the like. The modified silica is used as a modified raw material of fumed silica in the invention.
N-heptyl isocyanate: organic compound, transparent yellow liquid. In the present invention, the modified material is used as a medium short chain modification material introduced into fumed silica.
2-naphthyl isocyanate: an organic compound, white flaky crystals. In the invention, the modified silicon dioxide is used as a modified raw material for introducing benzene ring structures into gas phase method silicon dioxide.
Mercaptopropyl methyl dimethoxy silane: organic compound, a silane coupling agent. The invention is useful for introducing silanol groups into fumed silica.
The invention has the beneficial effects that:
compared with the prior art, the invention uses the modified fumed silica, introduces benzene ring structures and long and short chains on the surface of the fumed silica to provide different levels of steric hindrance, and can prevent aggregation among fumed silica particles; meanwhile, under the action of electrostatic repulsion force, the fumed silica particles are not easy to adsorb each other, and the dispersibility is further improved.
Compared with the prior art, the modified fumed silica can be attached to the surface of basalt fiber, and calcium ions and hydroxyl ions in concrete are adsorbed on the surface of basalt fiber, so that the number of crystal nuclei for generating hydrated calcium silicate gel in the hydration process is increased, the combination of fiber and cement matrix is more compact, and the mechanical property of the concrete is macroscopically improved.
Compared with the prior art, the silanol groups are introduced into the functional groups of the modified fumed silica, and can form one corner in the tetrahedral crystal structure, so that the original two-dimensional crystal structure is improved, and the problem of concrete layering is solved; the silanol groups also have the characteristic of easily forming hydrogen bonds, and can form hydrogen bonds by adjacent particles, so that the salt tolerance of the concrete is further improved.
Compared with the prior art, the invention adds the modified TiO doped with the iron ions in the concrete formula 2 The modified titanium dioxide is doped with iron ions, thereby improving the dioxideThe titanium has the catalytic capability, the iron ions are added into the crystal lattice of the titanium dioxide, and the iron ions replace a part of the titanium ions, so that the energy band structure of the titanium dioxide is adjusted, the photocatalytic performance of the titanium dioxide is changed, and CO in the air can be effectively degraded 2 。
Detailed Description
The invention is further illustrated by means of the following examples, which are not intended to limit the scope of the invention. The experimental methods, in which specific conditions are not noted in the following examples, were selected according to conventional methods and conditions, or according to the commercial specifications.
The comparative example and the examples of the present invention have the following parameters of part of raw materials:
tetramethyl isophthalylene diisocyanate, CAS number: 2778-42-9;
n-heptyl isocyanate, CAS number: 4747-81-3;
2-naphthyl isocyanate, CAS number: 2243-54-1;
mercaptopropyl methyl dimethoxy silane, CAS no: 31001-77-1;
benzoin dimethyl ether, CAS number: 24650-42-8.
Example 1
The green carbonization-resistant cement concrete is prepared by the following method:
s1, sequentially adding 480kg of P.O 42.5 ordinary Portland cement, 480kg of medium sand and 1050kg of crushed stone into 190kg of water, and mixing for 1h at a stirring rate of 25.5rpm to obtain concrete coarse material for later use;
s2, continuously and sequentially adding 1.2kg of basalt fiber with the length of 2mm, 15kg of high-dispersion fumed silica and 6.5kg of polycarboxylic acid high-performance water reducer into the concrete coarse material obtained in the step S1, and mixing for 2 hours at the stirring speed of 35rpm to obtain concrete mortar for later use;
and S3, pouring, curing and watering the concrete mortar obtained in the step S2, wherein the curing times are 3 times/day, and the curing period is 28 days, so that the green carbonization-resistant cement concrete is obtained.
The broken stone is continuous graded broken stone, and the mass ratio of the broken stone of 5-10 mm, the broken stone of 10-20 mm and the broken stone of 20-31.5 mm is 1:2:1 is obtained by blending.
The preparation method of the high-dispersion fumed silica comprises the following steps:
x1, placing 6kg of fumed silica in 100kg of hydrochloric acid with the concentration of 0.5mol/L, and soaking for 2 hours to obtain acidified fumed silica for later use;
x2 acidified fumed silica was dispersed in 225kg ethanol and diethyl ether at a mass ratio of 4:1, then adding 15kg of tetramethyl-m-xylylene diisocyanate and 2.5kg of n-heptyl isocyanate, and reacting for 24 hours at 85 ℃ under the protection of nitrogen to obtain a reaction solution I for later use;
under the protection of X3 nitrogen, the temperature of the reaction liquid I is reduced to 65 ℃, 35kg of propylene glycol butyl ether is added, and the reaction is continued for 2.5 hours to obtain a reaction liquid II for standby;
under the protection of X4 nitrogen, 0.9kg of 2, 2-bis (hydroxymethyl) malonic acid is added into the reaction liquid II, the solid product is obtained after the reaction is continued for 2 hours, and the high-dispersion fumed silica is obtained after alcohol washing for 3 times, drying and crushing.
Example 2
The green carbonization-resistant cement concrete is prepared by the following method:
s1, sequentially adding 480kg of P.O 42.5 ordinary Portland cement, 480kg of medium sand and 1050kg of crushed stone into 190kg of water, and mixing for 1h at a stirring rate of 25.5rpm to obtain concrete coarse material for later use;
s2, continuously and sequentially adding 1.2kg of basalt fiber with the length of 2mm, 15kg of high-dispersion fumed silica and 6.5kg of polycarboxylic acid high-performance water reducer into the concrete coarse material obtained in the step S1, and mixing for 2 hours at the stirring speed of 35rpm to obtain concrete mortar for later use;
and S3, pouring, curing and watering the concrete mortar obtained in the step S2, wherein the curing times are 3 times/day, and the curing period is 28 days, so that the green carbonization-resistant cement concrete is obtained.
The broken stone is continuous graded broken stone, and the mass ratio of the broken stone of 5-10 mm, the broken stone of 10-20 mm and the broken stone of 20-31.5 mm is 1:2:1 is obtained by blending.
The preparation method of the high-dispersion fumed silica comprises the following steps:
x1, placing 6kg of fumed silica in 100kg of hydrochloric acid with the concentration of 0.5mol/L, and soaking for 2 hours to obtain acidified fumed silica for later use;
x2 acidified fumed silica was dispersed in 225kg ethanol and diethyl ether at a mass ratio of 4:1, then adding 15kg of tetramethyl-m-xylylene diisocyanate and 0.8kg of 2-naphthyl isocyanate, and reacting for 24 hours at 85 ℃ under the protection of nitrogen to obtain a reaction solution I for later use;
under the protection of X3 nitrogen, the temperature of the reaction liquid I is reduced to 65 ℃, 35kg of propylene glycol butyl ether is added, and the reaction is continued for 2.5 hours to obtain a reaction liquid II for standby;
under the protection of X4 nitrogen, 0.9kg of 2, 2-bis (hydroxymethyl) malonic acid is added into the reaction liquid II, the solid product is obtained after the reaction is continued for 2 hours, and the high-dispersion fumed silica is obtained after alcohol washing for 3 times, drying and crushing.
Example 3
The green carbonization-resistant cement concrete is prepared by the following method:
s1, sequentially adding 480kg of P.O 42.5 ordinary Portland cement, 480kg of medium sand and 1050kg of crushed stone into 190kg of water, and mixing for 1h at a stirring rate of 25.5rpm to obtain concrete coarse material for later use;
s2, continuously and sequentially adding 1.2kg of basalt fiber with the length of 2mm, 15kg of high-dispersion fumed silica and 6.5kg of polycarboxylic acid high-performance water reducer into the concrete coarse material obtained in the step S1, and mixing for 2 hours at the stirring speed of 35rpm to obtain concrete mortar for later use;
and S3, pouring, curing and watering the concrete mortar obtained in the step S2, wherein the curing times are 3 times/day, and the curing period is 28 days, so that the green carbonization-resistant cement concrete is obtained.
The broken stone is continuous graded broken stone, and the mass ratio of the broken stone of 5-10 mm, the broken stone of 10-20 mm and the broken stone of 20-31.5 mm is 1:2:1 is obtained by blending.
The preparation method of the high-dispersion fumed silica comprises the following steps:
x1, placing 6kg of fumed silica in 100kg of hydrochloric acid with the concentration of 0.5mol/L, and soaking for 2 hours to obtain acidified fumed silica for later use;
x2 acidified fumed silica was dispersed in 225kg ethanol and diethyl ether at a mass ratio of 4:1, then adding 2.5kg of n-heptyl isocyanate and 0.8kg of 2-naphthyl isocyanate, and reacting for 24 hours at 85 ℃ under the protection of nitrogen to obtain a reaction solution I for later use;
under the protection of X3 nitrogen, the temperature of the reaction liquid I is reduced to 65 ℃, 35kg of propylene glycol butyl ether is added, and the reaction is continued for 2.5 hours to obtain a reaction liquid II for standby;
under the protection of X4 nitrogen, 0.9kg of 2, 2-bis (hydroxymethyl) malonic acid is added into the reaction liquid II, the solid product is obtained after the reaction is continued for 2 hours, and the high-dispersion fumed silica is obtained after alcohol washing for 3 times, drying and crushing.
Example 4
The green carbonization-resistant cement concrete is prepared by the following method:
s1, sequentially adding 480kg of P.O 42.5 ordinary Portland cement, 480kg of medium sand and 1050kg of crushed stone into 190kg of water, and mixing for 1h at a stirring rate of 25.5rpm to obtain concrete coarse material for later use;
s2, continuously and sequentially adding 1.2kg of basalt fiber with the length of 2mm, 15kg of high-dispersion fumed silica and 6.5kg of polycarboxylic acid high-performance water reducer into the concrete coarse material obtained in the step S1, and mixing for 2 hours at the stirring speed of 35rpm to obtain concrete mortar for later use;
and S3, pouring, curing and watering the concrete mortar obtained in the step S2, wherein the curing times are 3 times/day, and the curing period is 28 days, so that the green carbonization-resistant cement concrete is obtained.
The broken stone is continuous graded broken stone, and the mass ratio of the broken stone of 5-10 mm, the broken stone of 10-20 mm and the broken stone of 20-31.5 mm is 1:2:1 is obtained by blending.
The preparation method of the high-dispersion fumed silica comprises the following steps:
x1, placing 6kg of fumed silica in 100kg of hydrochloric acid with the concentration of 0.5mol/L, and soaking for 2 hours to obtain acidified fumed silica for later use;
x2 acidified fumed silica was dispersed in 225kg ethanol and diethyl ether at a mass ratio of 4:1, then adding 15kg of tetramethyl-m-xylylene diisocyanate, 2.5kg of n-heptyl isocyanate and 0.8kg of 2-naphthyl isocyanate, and reacting for 24 hours at 85 ℃ under the protection of nitrogen to obtain a reaction solution I for later use;
under the protection of X3 nitrogen, the temperature of the reaction liquid I is reduced to 65 ℃, 35kg of propylene glycol butyl ether is added, and the reaction is continued for 2.5 hours to obtain a reaction liquid II for standby;
under the protection of X4 nitrogen, 0.9kg of 2, 2-bis (hydroxymethyl) malonic acid is added into the reaction liquid II, the solid product is obtained after the reaction is continued for 2 hours, and the high-dispersion fumed silica is obtained after alcohol washing for 3 times, drying and crushing.
Example 5
The green carbonization-resistant cement concrete is prepared by the following method:
s1, sequentially adding 480kg of P.O 42.5 ordinary Portland cement, 480kg of medium sand and 1050kg of crushed stone into 190kg of water, and mixing for 1h at a stirring rate of 25.5rpm to obtain concrete coarse material for later use;
s2, continuously and sequentially adding 1.2kg of basalt fiber with the length of 2mm, 15kg of layering-resistant fumed silica and 6.5kg of polycarboxylic acid high-performance water reducer into the concrete coarse material obtained in the step S1, and mixing for 2 hours at the stirring speed of 35rpm to obtain concrete mortar for later use;
and S3, pouring, curing and watering the concrete mortar obtained in the step S2, wherein the curing times are 3 times/day, and the curing period is 28 days, so that the green carbonization-resistant cement concrete is obtained.
The broken stone is continuous graded broken stone, and the mass ratio of the broken stone of 5-10 mm, the broken stone of 10-20 mm and the broken stone of 20-31.5 mm is 1:2:1 is obtained by blending.
The preparation method of the delamination-preventing fumed silica comprises the following steps:
the method comprises the steps of Y1, placing 6kg of fumed silica in 100kg of hydrochloric acid with the concentration of 0.5mol/L, and soaking for 2 hours to obtain acidified fumed silica for later use;
y2 the acidified fumed silica was dispersed in 225kg ethanol and diethyl ether in a mass ratio of 4:1, then adding 15kg of tetramethyl-m-xylylene diisocyanate, 2.5kg of n-heptyl isocyanate and 0.8kg of 2-naphthyl isocyanate, and reacting for 24 hours at 85 ℃ under the protection of nitrogen to obtain a reaction solution I for later use;
under the protection of Y3 nitrogen, the temperature of the reaction liquid I is reduced to 65 ℃, 35kg of propylene glycol butyl ether is added, and the reaction is continued for 2.5 hours to obtain a reaction liquid II for standby;
under the protection of Y4 nitrogen, adding 0.9kg of 2, 2-bis (hydroxymethyl) malonic acid into the reaction liquid II, continuously reacting for 2 hours, separating to obtain a solid product, washing with alcohol for 3 times, drying, and crushing to obtain high-dispersion fumed silica for later use;
y5 dispersing high-dispersion gas-phase silicon dioxide in 100kg of N, N-dimethylformamide, then adding 6.5kg of mercaptopropyl methyl dimethoxy silane, reacting for 8 hours at 83 ℃, removing the solvent, continuing to react for 2 hours, separating to obtain a solid product, washing with alcohol for 3 times, washing with water for 3 times, drying, and crushing to obtain a solid product I for later use;
y6 dispersing the solid product I in 45kg of ethanol, adding 0.4kg of methacrylamide and 0.1kg of benzoin dimethyl ether, and reacting for 2 hours at 95 ℃ to obtain the layering-preventing gas phase method silicon dioxide.
Comparative example 1
The green carbonization-resistant cement concrete is prepared by the following method:
s1, sequentially adding 480kg of P.O 42.5 ordinary Portland cement, 480kg of medium sand and 1050kg of crushed stone into 190kg of water, and mixing for 1h at a stirring rate of 25.5rpm to obtain concrete coarse material for later use;
s2, continuously and sequentially adding 1.2kg of basalt fiber with the length of 2mm, 15kg of fumed silica and 6.5kg of polycarboxylic acid high-performance water reducer into the concrete coarse material obtained in the step S1, and mixing for 2 hours at the stirring speed of 35rpm to obtain concrete mortar for later use;
and S3, pouring, curing and watering the concrete mortar obtained in the step S2, wherein the curing times are 3 times/day, and the curing period is 28 days, so that the green carbonization-resistant cement concrete is obtained.
The broken stone is continuous graded broken stone, and the mass ratio of the broken stone of 5-10 mm, the broken stone of 10-20 mm and the broken stone of 20-31.5 mm is 1:2:1 is obtained by blending.
Example 6
The green carbonization-resistant cement concrete is prepared by the following method:
s1, sequentially adding 480kg of P.O 42.5 ordinary Portland cement, 480kg of medium sand and 1050kg of crushed stone into 190kg of water, and mixing for 1h at a stirring rate of 25.5rpm to obtain concrete coarse material for later use;
s2, continuously and sequentially adding 1.2kg basalt fiber with the length of 2mm, 15kg layering-resistant fumed silica, 6.5kg polycarboxylic acid high-performance water reducer and 6kg iron ion doped modified TiO into the concrete coarse material obtained in the step S1 2 Mixing for 2 hours at a stirring rate of 35rpm to obtain concrete mortar for later use;
and S3, pouring, curing and watering the concrete mortar obtained in the step S2, wherein the curing times are 3 times/day, and the curing period is 28 days, so that the green carbonization-resistant cement concrete is obtained.
The broken stone is continuous graded broken stone, and the mass ratio of the broken stone of 5-10 mm, the broken stone of 10-20 mm and the broken stone of 20-31.5 mm is 1:2:1 is obtained by blending.
The preparation method of the delamination-preventing fumed silica comprises the following steps:
the method comprises the steps of Y1, placing 6kg of fumed silica in 100kg of hydrochloric acid with the concentration of 0.5mol/L, and soaking for 2 hours to obtain acidified fumed silica for later use;
y2 the acidified fumed silica was dispersed in 225kg ethanol and diethyl ether in a mass ratio of 4:1, then adding 15kg of tetramethyl-m-xylylene diisocyanate, 2.5kg of n-heptyl isocyanate and 0.8kg of 2-naphthyl isocyanate, and reacting for 24 hours at 85 ℃ under the protection of nitrogen to obtain a reaction solution I for later use;
under the protection of Y3 nitrogen, the temperature of the reaction liquid I is reduced to 65 ℃, 35kg of propylene glycol butyl ether is added, and the reaction is continued for 2.5 hours to obtain a reaction liquid II for standby;
under the protection of Y4 nitrogen, adding 0.9kg of 2, 2-bis (hydroxymethyl) malonic acid into the reaction liquid II, continuously reacting for 2 hours, separating to obtain a solid product, washing with alcohol for 3 times, drying, and crushing to obtain high-dispersion fumed silica for later use;
y5 dispersing high-dispersion gas-phase silicon dioxide in 100kg of N, N-dimethylformamide, then adding 6.5kg of mercaptopropyl methyl dimethoxy silane, reacting for 8 hours at 83 ℃, removing the solvent, continuing to react for 2 hours, separating to obtain a solid product, washing with alcohol for 3 times, washing with water for 3 times, drying, and crushing to obtain a solid product I for later use;
y6 dispersing the solid product I in 45kg of ethanol, adding 0.4kg of methacrylamide and 0.1kg of benzoin dimethyl ether, and reacting for 2 hours at 95 ℃ to obtain the layering-preventing gas phase method silicon dioxide.
The modified TiO doped with iron ions 2 The preparation method of (2) is as follows:
1) 18mL of tetrabutyl titanate is dissolved in 65mL of absolute ethyl alcohol to obtain a solution A;
2) After mixing 1mL of ferric nitrate nonahydrate with 4mL of water, adding 7mL of absolute ethyl alcohol into the mixture, and adjusting the pH value of the solution to 5.5 by using 4mol/L nitric acid aqueous solution to obtain solution B;
3) Dropwise adding the solution A into the solution B at a speed of 1 drop/second, heating to 60 ℃ after the dropwise adding is finished, and stirring for reaction for 3 hours; cooling to 30deg.C after the reaction, filtering, collecting filter residue, washing with absolute ethanol for 3 times, drying in a 60 deg.C drying oven for 8 hr, and grinding to obtain modified TiO doped with iron ions 2 。
Test example 1
The sulfate resistance test of the green carbonized-resistant cement concrete prepared by the invention is carried out with reference to the specific requirements of GB/T50082-2009 section 14 sulfate erosion resistance test of common concrete test method Standard of the long-term performance and durability of common concrete. The test specimens were cubic specimens of dimensions 100 mm. Times.100 mm, and 3 specimens were prepared for each group. The test results were averaged as required, determined and expressed in terms of anti-sulfate scale. The green carbonation resistant cement concrete sulfate resistance ratings are shown in table 1.
TABLE 1
The higher the sulfate resistance level, the stronger the sulfate attack resistance of the concrete. As can be seen from the comparison of the above examples and comparative examples, the modified fumed silica is capable of improving the sulfate resistance grade of concrete. The reason for this may be that aggregation between fumed silica particles can be prevented because of the large steric hindrance provided by the benzene ring structure and the long and short chain in the modified fumed silica; after the functional groups are introduced, the fumed silica particles are not easy to adsorb with each other under the action of electrostatic repulsion, so that the aim of improving the dispersibility is fulfilled, the high-dispersion fumed silica effectively improves the pore structure of concrete, prevents the diffusion of corrosive salt ions and achieves the effect of improving the sulfate resistance grade.
Test example 2
The antifreeze performance test of the green carbonized resistant cement concrete is carried out according to the specific requirements of GB/T50082-2009 Standard for test method of the long-term performance and durability of common concrete, section 4 antifreeze test. The freezing resistance test adopts a slow freezing method, and the test adopts cubic test pieces with the dimensions of 100mm multiplied by 100mm, and 3 blocks are prepared for each group. The maintenance of the test specimen, the test operation and the precautions are carried out by referring to the steps in the national standard. The test results were averaged as required, determined and expressed in antifreeze scale. The results of the antifreeze performance test of the green carbonized resistant cement concrete are shown in Table 2.
TABLE 2
The higher the frost resistance of the concrete, the more excellent the frost resistance. As can be seen from the comparison between the examples and the comparative examples, the modified fumed silica is added in the invention, so that the frost resistance of the concrete can be effectively improved. The reason for this may be that the ordinary fumed silica has poor dispersibility, is difficult to effectively improve the pore structure of the concrete, and moisture easily permeates into the matrix through smile gaps in the concrete, and causes damage after repeated freeze thawing cycles; the modified fumed silica has strong dispersibility, can improve the pore structure and effectively prevent the penetration of moisture, so that the moisture in the matrix is less, and the matrix is not damaged by repeated freezing cycles.
Test example 3
The compressive strength test of the green carbonization-resistant cement concrete is carried out with reference to the specific requirements of GB/T50081-2019 Standard of test method for physical mechanical Properties of concrete section 5. The test pieces were cubic standard test pieces having a side length of 150mm, and 3 test pieces were prepared for each group. The test is carried out by referring to the specific steps in the national standard, and the result is averaged as required. The results of the compressive strength test of the green carbonized-resistant cement concrete are shown in table 3.
TABLE 3 Table 3
The higher the compressive strength of the concrete represents the greater the pressure limit when it is subjected to external forces. As can be seen from the comparison of the above examples and comparative examples, the addition of the modified fumed silica contributes to the improvement of the compressive strength of the concrete. The reason for this may be that the fumed silica can carry a large amount of concrete hydration products to adhere to the surface of the basalt fiber, and adsorb calcium ions and hydroxyl ions in the concrete on the surface of the basalt fiber, so that the number of crystal nuclei for generating hydrated calcium silicate gel in the hydration process is increased, the combination of the fiber and the cement matrix is more compact, and the mechanical properties of the concrete are macroscopically improved.
Test example 4
Carbonization resistance test: the method is carried out according to GB/T50082-2009 Standard for testing the long-term performance and the durability of common concrete. The temperature of the carbonization box is (20+/-2) DEG C, the relative humidity is (70+/-5)%, and CO 2 The concentration was (20.+ -. 3)%, the carbonation time was 28d, and the specific test results are shown in Table 4.
TABLE 4 Table 4
| Depth of carbonization | |
| Example 5 | 5.62 |
| Example 6 | 5.35 |
The lower the carbonization depth value, the better the carbonization resistance of the material. From the experimental data in Table 4, it is known that the modified TiO doped with iron ions is added 2 The carbonization resistance of the prepared concrete is obviously improved, and the possible reasons are that the modified titanium dioxide is doped with iron ions, the catalytic capability of the titanium dioxide is improved, the iron ions are added into the crystal lattice of the titanium dioxide, and the iron ions replace part of titanium ions, so that the energy band structure of the titanium dioxide is adjusted, the photocatalytic performance of the titanium dioxide is changed, and CO in the air can be effectively degraded 2 。
Claims (3)
1. The preparation method of the green carbonization-resistant cement concrete is characterized by comprising the following steps of:
s1, adding 480-540 parts of cement, 480-540 parts of medium sand and 1050-1200 parts of broken stone into 190-220 parts of water in sequence according to parts by weight, and stirring to obtain concrete coarse material for later use;
s2, in parts by weight, continuously adding 1.2-8 parts of basalt fiber, 15-36 parts of modified fumed silica, 6.5-13 parts of water reducer and 5-20 parts of iron ion doped modified TiO into the concrete coarse material obtained in the step S1 in sequence 2 Stirring to obtain concrete mortar for later use;
s3, pouring, curing and maintaining the concrete mortar obtained in the step S2 through construction to obtain the green carbonization-resistant cement concrete;
the modified TiO doped with iron ions 2 The preparation method of (2) is as follows:
1) Dissolving 15-20mL of tetrabutyl titanate in 60-70mL of absolute ethyl alcohol to obtain a solution A;
2) Mixing 1-2mL of ferric nitrate nonahydrate with 3-5mL of water, adding 6-7mL of absolute ethyl alcohol into the mixture, and regulating the pH value of the solution to 5-6 by using 3-5mol/L of nitric acid aqueous solution to obtain solution B;
3) Dripping the solution A into the solution B at the speed of 1-2 drops/second, heating to 60-80 ℃ after dripping, and stirring for reacting for 2-4 hours; cooling to 20-40deg.C after the reaction, filtering, collecting the residue, washing with absolute ethanol for 2-3 times, drying in a 60-80deg.C drying oven for 6-8 hr, and grinding to obtain modified TiO doped with iron ions 2 ；
The modified fumed silica is any one of high-dispersion fumed silica and delamination-preventing fumed silica;
the preparation method of the high-dispersion fumed silica comprises the following steps of:
taking 5-8 parts of fumed silica, placing the fumed silica in 75-125 parts of hydrochloric acid with the concentration of 0.1-0.5 mol/L, and soaking the fumed silica for 1-3 hours to obtain acidified fumed silica for later use;
x2, dispersing acidified gas phase silicon dioxide in a mixture formed by ethanol and diethyl ether, then adding 8-24 parts of tetramethyl-m-xylylene diisocyanate, 1.5-5 parts of n-heptyl isocyanate and 0.3-1.2 parts of 2-naphthyl isocyanate, and reacting for 12-36 hours at 80-90 ℃ under an anaerobic condition to obtain a reaction solution I for standby; the using amount of the mixture formed by the ethanol and the diethyl ether is 150-300 parts, wherein the mass ratio of the ethanol to the diethyl ether is 4:1, a step of;
x3 is kept under anaerobic condition, the temperature of the reaction solution I is reduced to 55-70 ℃, 24-56 parts of propylene glycol butyl ether is added, and the reaction is continued for 1-4 hours, so as to obtain a reaction solution II for standby;
x4 is kept under anaerobic condition, 0.4-2 parts of 2, 2-bis (hydroxymethyl) malonic acid is added into the reaction solution II, the reaction is continued for 1-4 hours, then solid products are obtained after separation, and the high-dispersion fumed silica is obtained after alcohol washing, drying and crushing;
the preparation method of the delamination-preventing fumed silica comprises the following steps of:
5-8 parts of fumed silica is taken and placed in 75-125 parts of hydrochloric acid with the concentration of 0.1-0.5 mol/L, and soaked for 1-3 hours to obtain acidified fumed silica for later use;
dispersing acidified gas phase silicon dioxide in a mixture formed by ethanol and diethyl ether, then adding 8-24 parts of tetramethyl-m-xylylene diisocyanate, 1.5-5 parts of n-heptyl isocyanate and 0.3-1.2 parts of 2-naphthyl isocyanate, and reacting for 12-36 hours at 80-90 ℃ under an anaerobic condition to obtain a reaction solution I for later use; the using amount of the mixture formed by the ethanol and the diethyl ether is 150-300 parts, wherein the mass ratio of the ethanol to the diethyl ether is 4:1, a step of;
y3 is kept under anaerobic condition, the temperature of the reaction solution I is reduced to 55-70 ℃, 24-56 parts of propylene glycol butyl ether is added, and the reaction is continued for 1-4 hours, so as to obtain a reaction solution II for standby;
y4 is kept under anaerobic condition, 0.4-2 parts of 2, 2-bis (hydroxymethyl) malonic acid is added into the reaction solution II, the reaction is continued for 1-4 hours, then solid products are obtained after separation, and alcohol washing, drying and crushing are carried out, thus obtaining high-dispersion fumed silica for standby;
y5 dispersing high-dispersion gas-phase silicon dioxide in 100-150 parts of N, N-dimethylformamide, then adding 5-8 parts of mercaptopropyl methyl dimethoxy silane, reacting for 6-12 hours at 75-90 ℃, removing solvent, continuing to react for 1-4 hours, separating to obtain a solid product, and then washing with alcohol, washing with water, drying and crushing to obtain a solid product I for later use;
dispersing the solid product I in 30-90 parts of ethanol, adding 0.3-0.6 part of methacrylamide and 0.1-0.2 part of benzoin dimethyl ether, and reacting for 1-3 hours at the temperature of 80-120 ℃ to obtain the layering-resistant fumed silica.
2. The method for preparing green anti-carbonization cement concrete according to claim 1, wherein: the broken stone is continuous graded broken stone, and the mass ratio of the broken stone of 5-10 mm, the broken stone of 10-20 mm and the broken stone of 20-31.5 mm is 1:2:1 is obtained by blending.
3. The green carbonization-resistant cement concrete is characterized in that: prepared by the method of any one of claims 1-2.
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